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模拟滤波器(第2版)
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This chapter describes the roles and basic concepts of analog filters, their
applications in electrical engineering, and certain fundamental ideas and
terminology associated with them.
The term filter is used in many different ways in electrical engineering.
An algorithm in a computer program that makes a decision on which
commands and how certain commands are executed performs a filtering
function. A decision technique that estimates the input signal from a set
of signals and noise is known as optimal filtering. In analog and digital
signal processing, filters eliminate or greatly attenuate the unwanted
portion of an input signal. These analog and digital filtering processes
may be performed in real-time or in off-line situations.
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